Abstract
The objective of the present study was to determine the crop coefficient (Kc) of wheat and soil water evaporation (Ke) in Maringá, PR, Brazil. Wheat crop evapotranspiration (ETc) was determined through the water balance method, using drainage lysimeters integrated with soil moisture measurements. The ETo was calculated using the Penman-Monteith equation with climate data from an automatic weather station, then Kc was calculated. Microlysimeters were built, using PVC pipes with 100 mm diameter and 150 mm length, which were weighted every day to obtain the quantity of water evaporated and then the soil water evaporation coefficient (Ke) was calculated. The calculated values of Kc were compared with values presented by FAO 56. The calculated Kc were 0.67, 0.67, 1.01, 1.03 and 0.42 for tillering, stem extension, heading, flowering and ripening, respectively. The values of Kc presented high correlation and precision as compared to FAO model. The values of evaporation determined through microlysimeters were greater as compared to the ETo during the beginning of the experiment, when soil was uncovered and decreased during the crop development. Key words: FAO 56, wheat, drainage lysimeters, microlysimeters, evapotranspiration.
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